Control system for electric elevators



Oct 11| y IWUVI xzsf LLL) E'. W. SEEGER CGNTRQL SYSTEM FOR ELECTRIC ELEVATORS Filed April 14, 1924 2 Sheets-Sheet 2 oct.; 11, 1921. 1,645,075

V By glp;

' E 12a ATTORNEY Patented Oct. 11, 1927.

UNITED STATES v 41,645,075 PATENT oFFlca.

EDWIN W. SEEGER, 0F MILWAUEE, WISCONSIN, ASSIGNOB TO THE CUTLEB-HAI- -v MER .M FG. CO., OF MILWAUKEE, WISCONSIN, A CORPORATION OF WISCONSIN.

CONTROL SYSTEM FOR ELECTRIC ELEVATOBiS.

Application med April 14, 1924. Serial No. 706,424.V

This invention relates to control systems for electric elevators and the like.

In numerous elevator installations the traffic conditions are such that it is usually necessary to stop the car at everylanding and the present invention has among its objects to provide an improved automatic controller for such installations.

Another object is to provide a controller for installations of the aforesaid character which provides for automatic stopping of the elevator car at every landin during ascent and descent thereof and W ich also provides for restarting of the elevator-when the same is at any landin by opening and reclosure of the associated oor or gate.

Another object is to provide an automatic controller of the aforesaid character including control means for preventing, when desired, automatic stopping of the elevator car at any of the landings.

Another object is to provide an automatic controller of the aforesaid character` including control means for stop ing the elevator car at an point between t e several landings and ot 1er control means for effecting inching operations thereof in either direction.

Various other objects and advantages of the invention will hereinafter appear.

The accompanying drawing diagrammatically illustrates an embodiment of the invention and the same will now be described, it being understood that the embodiment illustrated is susceptible of modification without departing from the scope of the appended claims. Y

In the drawing Figure 1 is a diagrammatic view of the controller;

Fig. 2 is a so-called across the line diagram of the control means illustrated in Fi 1.

Fig. 3 illustrates an 'operating mec anism for certain of the contacts shown in Fig. 1, and

Fig. 4 illustrates a modification of the controller shown in Fig. 1.

Referring to Fig; 1 thel same illustrates an elevator car 1, a three-phase driving motor M therefor, and a pair of electromagnetic double le reversing switches 2 andl 3 for controlling the continuity of the line connections for such nmtor. Reversing switches 2 and 3 are controlled by relays 4 and 5 re' spectively, and for a purpose hereinafter set lstationary contacts arranged 'on op forth each of said lreversing switches is provided with normally open auxiliary contacts a and normally closed auxiliary contacta In addition to the foregoing more or less conventional elements, the controller includes an automatic floor selector, indicated generally at 6, which is operated by a shaft 7 driven at a reduced speed by the driving motor or otherwise operated in synchronism with the elevator car. The selector acts in conjunction with door stop relays 8, 9 10 and. 11, o ne of said relays being provided for each landlng, in the present instance, four. Also for purposes hereinafter set forth the controller 'includes a non-interference relay 12 having normally closed contacts'12 and normally open contacts 12"; switches DS1 to DS, inclusive, associated with the doors or gates at the several landings and control 'l5 pushbuttons 13 to 16, inclusive, mounted in the elevator car, the pushbuttons 13,. 14

and 16 being normally open and the push button 15 being normally closed.

The floor selector 6 includes control de-I vices 17 and 18, each of which is operated from shaft 7. Device 17 includes movable contacts 19 to 22, inclusive, one being provided for each landing and two groups of site sides of said movable contacts, one o said groups including contacts 20, 21* and 22* to cooperate with contacts 2 0, 21 and 22, respectively, and the other includin contacts 19, 2()b and 21h to coo erate wit contacts 19, 20 and 21, respectivel Contacts 19 to 22 are operated from s aftr7 b a mechanism of the character shown in corresponding to such -landing is heldin anv intermediate position by engagement of the operating arm e with the fork 'rejection o 3. As shown in the figure, each of theconsuch contact. However, each o lthe mov.

able contacts of device 17 is moved to one extreme position by its associated arm e and fork projection d when the elevator car is above 4its corresponding landing and to its other extreme position by such partel when the elevator car is below its coriesponding landing. Control device 18 includes a series of stationary contacts 23 to 28 inclusive and a. cooperating movable contact arm 29 which is operatively connectedto shaft 7 through the medium of a lost motion connection including a pin 30 fixed to Said contact army and a member 31 fixed to said shaft. Member 31 is provided with spaced shoulders 32 and 33 for engaging opposite sides of said pin and the arrangement is such that when the elevator car is in one extreme osition contact arm 29 occupies the position shown in full lines while in the other extreme position of the elevator car said contact'arm occupies the position shown in dotted lines. Assuming that the full line position-of contact arm 29 corresponds to the first floor position of the car, during movement of the car to the second landing the lost motion between shoulder 32 and pin 30 is taken u and upon arrival of the car at the` secon landing contact arm 29 engages contact y24. lUpon movement 'of the car to a position opposite the third landing contact arm 29 engages contact 26 and upon movement of the car to a vposition opposite thev fourth landing contact arm 29 engages contact 28. During downward movement of the car from the fourth landing the lost motion between shoulder 33 and pin 30 is taken up and when the car is opposite the third landing, contact arm 29 engages contact 27. Upon continued downward movement of the car, contact arm 29 engages contact 25 when the car is opposite the second landing and said arm returns to its full line position when the car reaches the first landing.

The function and operation of the controller together with the circuit connections therefor will now be more fully described in connection with Fig. 2. Reversing switches 2 and 3 provide for establishment of reverse ower connections for motor M from line L and L, such connections being a parent fromFig. 1, and it is assumed t at reversing switch 2 provides for upward operation of the elevator while reversing switch 3 provides for downward operation thereof. All of the control circuits extend from line L through door switches DSx t0 DS, inclusive and push button to a conductor 35. Relays 4 and -5 serve to connect the operating lwindings of reversing switches 2 and 3, respectively, between conductor 35 and line L2 and floor selector device 6 serves to establish a plurality of energizing circuits for relays 4 and 5 from conductor 35 to line L", all of such circuits extending through the normally closed contacts 12 of the non-interference relay 12. Each of the reversing switches in closing insures against energization of the control relay associated with the other reversing switch through opening of its auxiliary contacts 2l or 3l as the case may be and establishes an energizing circuit for the non-'interference relay 12 between conductor 35 and line L2 through the medium of its auxiliary contacts 2n or 3 as the case may be. In responding non-interference relay 12 maintains itself between conductor 35 and line L2 through the medium ot its auxiliary contacts 12"` and the same will remain in closed position pending opening of one of the door switches or the push button switch 15.

Assuming that the floor selector (l is in the position shown when the elevator car is at the first landing and that the same operates in the manner above described, it is apparent from the foregoing that if the door switch DSl has been opened contacts 12a of the non-interference relay 12 will be in closed position. Immediately upon closure of door switch DS1 relays 4 and 9 respond, the operating windings thereof being connected between conductor 35 and line L through auxiliary contacts k3b of reversing switch 3, contacts and 20" of control device 17. contact 23 and arm 29 of control device 18 and contacts 12 of non-interference relay 12. Relay 9 in closing establishesv through its contacts 9l a maintaining circuit for its operating winding and also the oper ating winding of relay 4 from conductor to line L2 through the auxiliary contacts 3b of reversing switch 3 and contacts 20 and 20 of control device 1T, and relay 4 in closing effects response of reversing switch 2. Upon response of reversing switch 2 noninterference relay 12 responds and maintains itself as above set forth. Upon arrival of the car at the second landing contact arm 29 engages contact 24 and contact 20 disengages contact 20 to leenergize re-y lays 4 and 9 for opening of reversing switch 2. The elevator car will then remain at the second landing pending opening and reclosure of the door switch DS1. Upon opening of door switch D52 the energizing circuit for non-interference relay 12 is intel'- rupted and upon reclosurc of said door switch, relays 4 and 10 are energized through contacts 21 and 21a of device 17 and contact 24 and arm 29 of device 18 and the former relay in responding maintains itself and also relay 4 in closed position through closure of its contacts 10a. Reversing switch then rccloses for continued upward operation of the elevator car and the non-interference relay 12 responds and maintains itself through its contacts 12. Upon arrival of the elevator car at the third landing contact arm 29 moves into engagement with contact 2G and contact 21 moves out of enagement with contact 21a1 to deenergize reays 10 and 4 for opening of reversing switch 2. The elevator` car remains at the third landing pending opening and reclosure of the door switch DS3. Upon opening of the door switch DS3 the energizin-g circuit for relay 12 is interrupted and upon reclosure of said door switch relays 4 'and 11y are energized through contacts 22 and 22 of device 17 and contact 26 and arm "29 of device 18 and the latterv relay in responding maintains itself and also relay 4in closed osition through closure of its contacts 11a.

eversing switch 2 then recloses for movement of the elevator car to the fourth landing and the non-interference relay 12 again responds and maintains itself in closed position. Upon arrival of the elevator car at the fourth landing contact 22 disengages contact 22 to deenergize relays 4 andV 11 for opening of reversing switch 2 and upon opening of the door switch DS4l non-interference relay 12 is deenergized.

When the elevator car is yat the fourth landing the movable contactsof device 17 will occup the positions shown'in dotted lines and tie contact arm 29 will also be in its dotted line iosition. Upon reclosure of door switch D 4 relays 5 and 10 are energized through the medium of contacts 21 and .21b of device 17. and contact 28 and arm 29 of dcvice18 and the latter-relay in responding maintains itself and also relay in closed position through its contacts Reversing switch 3 then closes for downward movement of theelevator car and the contacts 3 thereof effect energization of non-interference relay 12. Upon arrival of the car at the third landing contact arm 29 moves into engagement with contact 27 while contact 21 disengages contact 21b to deenergize relays 5 and 10 vfor opening of the reversing switch 3. The elevator car will then remain at the third landing pending opening and reclosnre of the door switch Di. Upony opening of the door switch DS3 the energizing circuit for lnon-interference relay 12 is interrupted and upon reclosure of said door switch relays 5 and 9 are energized through the medium of contacts 2O and 20b of device 17, and arm 29 and contact 27 of device 18 and the latter relayA in responding maintainsA itself and also relay 5 in closed posii.

tion, through its contacts 9a. Reversing switch 3 and non-interference relay 12 then respond and the elevator car moves downwardly to the second landing. Upon arrival of the elevator car at the lsecond landing relays 5 and 9 are deenergized through disengagement of contacts and 2()b and contact arm 29 moves into engagement. with contact 25. Upon deenergization of relay 5 reversing switch 3 opens to stop the car at the second landing and the non-interference relay 12 maintains itself 'in closed position. Upon opening of the door switch D82 noninterference relayv 12 is deenergized and upon reelosure thereof relaysy 5 and 8 are venergized through the medium of contacts 19 and 19h of device 17 and contact 25 and arm 29 of device 18. Relay 8 in responding maintains itself and also relay -5 in a closed position throu h its contacts 8a and closure ot the latter re ay effects closure of reversing switchv 3 which in turn eii'ects closure of nonvinterference lrelay 12. When the elevator car arrives at thetirst landing reversing switch 3 is opened to stop the elevato] through deenergization of relays 8 and 5 by disengagement of contacts 19 and 19". .Y

From the foregoing it is apparent that the aforedescribed control means, provides for automatic stopping ofthe elevator car at each landing both during ascent and .descent thereof and also provides for restait ing'of the elevator car when the sameis aty any landing by opening and reclosure ofthe associated door or gate.

It is sometimes desired to prevent automatic stopping of the elevator carat a selected landing and for this purpose push v the control circuits extend-through push `button 15 and it is thus apparent that when the elevator car is in any position between the various landings, opening of'such push button will immediately interrupt the ener izing circuits of the reversing switches toI e 'ect immediate stopping of the elevator. Furthermore, `it should be noted that push button switches 13 and 14 are connected in shunt with operating windings of vrelays/1 and 5, respectively, whereby closure of pushVV button switch 13 will eiect energization of reversing switch 2 for upward movement of the elevator while closure of switch 14 will effect energization of 'reversing switch 3 for downward operation of the elevator. It is thus apparent that the push buttons 13 and circuit extending through' the normally closed contacts 12 of non-interference relay 12.` As hereinbefore set forth the various energizing circuits established bythe door switches for effecting response of relays 4 and 5, all extend through the normally closed contacts 12* of non-interference rela 12 and it is thus apparent that with the pus button switch 36 arranged as shown in Fig. 4 it is necessary when the elevator car is at any landing to close the associated door" switch and to also close said push button switch in order to start the elevator.

, What I claim as new and desire to secure by Letters Patent is:

1. In a controller for motor operated elevators, in combination, switches for establishing reverso power connections for the motor and control means therefor providing for operation of the motor in opposite directions 'through a (given ran e and for manual starting an automatic stoppin thereof at predetermined points in such range, said means including a luralit of manually operated switches, eac for e ecting starting ofthe motor at only one of said stopping points and means actin upon stopping o to necessitate given operations of the corresponding control switchl as a prerequisite to starting of the motor.

2. In a controller for motor operated elevators, in combination, switches for estab,- lishing reverse power connections -for the motor, a device tobe driven in synchronism with the elevatorl car and means acting through said device to control4 said reversing switches for operation of the motor in opposite directions through a given range and lfor manual starting and automatic stopping thereof at predetermined points in suc range, said means `including a plurality of manually operated control switches, each for effecting starting of the motor at only one of said stopping points and means actin upon stopping of the motor at any of sai points to necessitate given operations of the corresponding control switch as a prerequisite to starting of the motor.

3. In a controllerfor motor operated elevators, in combination, a control device to be driven in synchronism with the elevator car, means acting through said device to provide for operation of said motor in o posite directions through a given range an for manual starting and automatic stopping thereof at given points in such range, said means including a plurality of manually operated control switches, each for effecting starting of the motor at only stopping points and means actlng upon stopping of t e motor atany of said points to Anecessitate opening and reclosure of the corresponding control switch as a prerequisite to starting of the motor.

4. In a controller for motor operated elevators, in combination, means for effecting operation of the motor in opposite directions through a given ran e and providing for manual starting an automatic stopping the motor at any of sai points i one of said y thereof at predetermined points in such range, said means including a control device of said control switches as a prerequisite to starting of said motor.

5. In a controller for motor operated elevators, in'combination, switches for establishing reverse power connections for the motor, a device to be driven in synchronism with the elevator car, control means acting through said device to control said reversing switches for operation of said motor in opposite directions through a given range and for manual starting and automatic stoppin thereof at given points in such range an means associated with said control means to prevent automatic stopping of said elevator at any of said points.

6. In a controller for motor operated ele'- vators, in combination, switches for establishing reverse power connections for the motor, a device ,to be driven in synchronism with the elevator car, control means acting through said device to control said reversing switches for operation of said motor in' opposite directions through a given range and for manual starting and automatic stopping thereof at given points in such range and means for stopping said motor at any point in said range and for restarting the same in either direction selectively.

7. In a controller for motor operated elevators, in combination, switches for establishing reverse power connections for the motor and control means for said switches providing for operation of said motor in opposite directions through a given range and also providing for manual starting and automatic stopping thereof at predetermined points in such range, said control means including a plurality of devices to be driven in synchronism with the elevator car, one of said devices being adapted to selectively establish a plurality of energizing circuits for said reversing switches through the other of said devices at said redetermined points and said latter device ing adapted at said points to selectively interrupt the energizing circuits established therethrough by said former device.

8. In a controller for motor operated elevators, in combination, switches for estab'- lishing reverse power connections for the motor and control means for said switches providing for operation of the motor in opposite directions through a given range and for manual starting and automatic stopping ing adapted to selectively establish a pluraivice, and a non-interference relay for preity of energizing circuits for said reversing venting completion of the energizing circuits switches through the other of said devices at for said reversing switches by said devices. 10 Said predetermined points and said latter In witness whereof, I have hereunto sub- 5 device being adapted at said points to selecscribed my name.

tively interrupt the energizing circuits established therethrough by sai former de- EDWIN W. SEEGER. 

